file permission example

touch testfile
ls -l testfile
-rw-r--r--   1 yourname yourname    0 2011-04-05 05:44 testfile

chmod u+wx testfile
ls -l testfile
-rwxr--r--   1 yourname yourname    0 2011-04-05 05:44 testfile

chmod ug-x testfile
ls -l testfile
-rw-r--r-- 1 yourname yourname 0 2011-04-05 05:44 testfile

chmod a-r testfile
ls -l testfile
--w------- 1 yourname yourname 0 2011-04-05 05:44 testfile

Which user?
u     user/owner
g     group
o     other
a     all
What to do?
+     add this permission
-     remove this permission
=     set exactly this permission
Which permissions?
r     read
w     write
x     execute

转载于:https://www.cnblogs.com/greencolor/archive/2011/04/05/2006106.html